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      <h1 class="post-title">SpringBoot之线程池异步方法调用</h1>

      <div class="post-meta">
        <span class="post-time"> 2020-11-05 </span>
        <div class="post-category">
            <a href="/categories/java/"> java </a>
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    <div class="post-toc" id="post-toc">
  <h2 class="post-toc-title">文章目录</h2>
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    <nav id="TableOfContents">
  <ul>
    <li>
      <ul>
        <li><a href="#代码备忘">代码备忘</a>
          <ul>
            <li><a href="#applicationyml">application.yml</a></li>
            <li><a href="#asyncconfiguration类">AsyncConfiguration类</a></li>
            <li><a href="#service类">service类</a></li>
            <li><a href="#调用类">调用类</a></li>
          </ul>
        </li>
        <li><a href="#总结">总结</a></li>
      </ul>
    </li>
  </ul>
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</div>
    <div class="post-content">
      <h2 id="代码备忘">代码备忘</h2>
<h3 id="applicationyml">application.yml</h3>
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<pre class="chroma"><code class="language-yml" data-lang="yml"><span class="nt">spring</span><span class="p">:</span><span class="w">
</span><span class="w">  </span><span class="nt">task</span><span class="p">:</span><span class="w">
</span><span class="w">    </span><span class="nt">execution</span><span class="p">:</span><span class="w">
</span><span class="w">      </span><span class="nt">thread-name-prefix</span><span class="p">:</span><span class="w"> </span><span class="l">stub-task-</span><span class="w">
</span><span class="w">      </span><span class="nt">pool</span><span class="p">:</span><span class="w">
</span><span class="w">        </span><span class="nt">core-size</span><span class="p">:</span><span class="w"> </span><span class="m">2</span><span class="w">
</span><span class="w">        </span><span class="nt">max-size</span><span class="p">:</span><span class="w"> </span><span class="m">50</span><span class="w">
</span><span class="w">        </span><span class="nt">queue-capacity</span><span class="p">:</span><span class="w"> </span><span class="m">10000</span><span class="w">
</span></code></pre></td></tr></table>
</div>
</div><h3 id="asyncconfiguration类">AsyncConfiguration类</h3>
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<pre class="chroma"><code class="language-java" data-lang="java"><span class="kn">package</span> <span class="nn">cn.lglspace.stulab.config</span><span class="o">;</span>

<span class="kn">import</span> <span class="nn">java.util.concurrent.Executor</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">java.util.concurrent.ThreadPoolExecutor</span><span class="o">;</span>

<span class="kn">import</span> <span class="nn">org.slf4j.Logger</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.slf4j.LoggerFactory</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.aop.interceptor.SimpleAsyncUncaughtExceptionHandler</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.boot.autoconfigure.task.TaskExecutionProperties</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.context.annotation.Bean</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.context.annotation.Configuration</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.scheduling.annotation.AsyncConfigurer</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.scheduling.annotation.EnableAsync</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor</span><span class="o">;</span>

<span class="nd">@Configuration</span>
<span class="nd">@EnableAsync</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">AsyncConfiguration</span> <span class="kd">implements</span> <span class="n">AsyncConfigurer</span> <span class="o">{</span>

    <span class="kd">private</span> <span class="kd">final</span> <span class="n">Logger</span> <span class="n">log</span> <span class="o">=</span> <span class="n">LoggerFactory</span><span class="o">.</span><span class="na">getLogger</span><span class="o">(</span><span class="n">AsyncConfiguration</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>

    <span class="kd">private</span> <span class="kd">final</span> <span class="n">TaskExecutionProperties</span> <span class="n">taskExecutionProperties</span><span class="o">;</span>

    <span class="kd">public</span> <span class="nf">AsyncConfiguration</span><span class="o">(</span><span class="n">TaskExecutionProperties</span> <span class="n">taskExecutionProperties</span><span class="o">)</span> <span class="o">{</span>
        <span class="k">this</span><span class="o">.</span><span class="na">taskExecutionProperties</span> <span class="o">=</span> <span class="n">taskExecutionProperties</span><span class="o">;</span>
    <span class="o">}</span>

    <span class="nd">@Override</span>
    <span class="nd">@Bean</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">&#34;stulab-async-executor&#34;</span><span class="o">)</span>
    <span class="kd">public</span> <span class="n">Executor</span> <span class="nf">getAsyncExecutor</span><span class="o">()</span> <span class="o">{</span>
    	<span class="n">log</span><span class="o">.</span><span class="na">debug</span><span class="o">(</span><span class="s">&#34;init stulab async executor...&#34;</span><span class="o">);</span>
        <span class="n">ThreadPoolTaskExecutor</span> <span class="n">executor</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ThreadPoolTaskExecutor</span><span class="o">();</span>
        <span class="n">executor</span><span class="o">.</span><span class="na">setCorePoolSize</span><span class="o">(</span><span class="n">taskExecutionProperties</span><span class="o">.</span><span class="na">getPool</span><span class="o">().</span><span class="na">getCoreSize</span><span class="o">());</span>
        <span class="n">executor</span><span class="o">.</span><span class="na">setMaxPoolSize</span><span class="o">(</span><span class="n">taskExecutionProperties</span><span class="o">.</span><span class="na">getPool</span><span class="o">().</span><span class="na">getMaxSize</span><span class="o">());</span>
        <span class="n">executor</span><span class="o">.</span><span class="na">setQueueCapacity</span><span class="o">(</span><span class="n">taskExecutionProperties</span><span class="o">.</span><span class="na">getPool</span><span class="o">().</span><span class="na">getQueueCapacity</span><span class="o">());</span>
        <span class="n">executor</span><span class="o">.</span><span class="na">setThreadNamePrefix</span><span class="o">(</span><span class="n">taskExecutionProperties</span><span class="o">.</span><span class="na">getThreadNamePrefix</span><span class="o">());</span>
        <span class="n">executor</span><span class="o">.</span><span class="na">setRejectedExecutionHandler</span><span class="o">(</span><span class="k">new</span> <span class="n">ThreadPoolExecutor</span><span class="o">.</span><span class="na">CallerRunsPolicy</span><span class="o">());</span>
        <span class="n">executor</span><span class="o">.</span><span class="na">initialize</span><span class="o">();</span>
        <span class="k">return</span> <span class="n">executor</span><span class="o">;</span>
    <span class="o">}</span>
	
    <span class="nd">@Override</span>
    <span class="kd">public</span> <span class="n">AsyncUncaughtExceptionHandler</span> <span class="nf">getAsyncUncaughtExceptionHandler</span><span class="o">()</span> <span class="o">{</span>
        <span class="k">return</span> <span class="k">new</span> <span class="n">SimpleAsyncUncaughtExceptionHandler</span><span class="o">();</span>
    <span class="o">}</span>
    
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h3 id="service类">service类</h3>
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<pre class="chroma"><code class="language-java" data-lang="java"><span class="kn">package</span> <span class="nn">cn.lglspace.stulab.service</span><span class="o">;</span>

<span class="kn">import</span> <span class="nn">java.util.concurrent.TimeUnit</span><span class="o">;</span>

<span class="kn">import</span> <span class="nn">org.springframework.scheduling.annotation.Async</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.stereotype.Service</span><span class="o">;</span>

<span class="nd">@Service</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">HelloService</span> <span class="o">{</span>
	
	<span class="nd">@Async</span><span class="o">(</span><span class="s">&#34;stulab-async-executor&#34;</span><span class="o">)</span>
	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">execTask1</span><span class="o">()</span> <span class="o">{</span>
		<span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">&#34;task1....&#34;</span><span class="o">+</span><span class="n">Thread</span><span class="o">.</span><span class="na">currentThread</span><span class="o">().</span><span class="na">getName</span><span class="o">());</span>
	<span class="o">}</span>
	
	<span class="nd">@Async</span><span class="o">(</span><span class="s">&#34;stulab-async-executor&#34;</span><span class="o">)</span>
	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">execTask2</span><span class="o">(){</span>
		<span class="k">try</span> <span class="o">{</span>
			<span class="n">TimeUnit</span><span class="o">.</span><span class="na">SECONDS</span><span class="o">.</span><span class="na">sleep</span><span class="o">(</span><span class="n">12</span><span class="o">);</span>
		<span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="n">InterruptedException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span>
			<span class="n">e</span><span class="o">.</span><span class="na">printStackTrace</span><span class="o">();</span>
		<span class="o">}</span>
		<span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">&#34;task2....&#34;</span><span class="o">+</span><span class="n">Thread</span><span class="o">.</span><span class="na">currentThread</span><span class="o">().</span><span class="na">getName</span><span class="o">());</span>
	<span class="o">}</span>
	
	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">execSyncTask</span><span class="o">()</span> <span class="o">{</span>
		<span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">&#34;sync task....&#34;</span><span class="o">+</span><span class="n">Thread</span><span class="o">.</span><span class="na">currentThread</span><span class="o">().</span><span class="na">getName</span><span class="o">());</span>
	<span class="o">}</span>
	
<span class="o">}</span>

</code></pre></td></tr></table>
</div>
</div><h3 id="调用类">调用类</h3>
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<pre class="chroma"><code class="language-java" data-lang="java"><span class="kn">package</span> <span class="nn">cn.lglspace.stulab.web</span><span class="o">;</span>

<span class="kn">import</span> <span class="nn">org.springframework.beans.factory.annotation.Autowired</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.web.bind.annotation.RequestMapping</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.web.bind.annotation.RestController</span><span class="o">;</span>

<span class="kn">import</span> <span class="nn">cn.lglspace.stulab.service.HelloService</span><span class="o">;</span>

<span class="nd">@RestController</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">HelloController</span> <span class="o">{</span>
	<span class="nd">@Autowired</span>
	<span class="kd">private</span> <span class="n">HelloService</span> <span class="n">helloService</span><span class="o">;</span>
	
	<span class="nd">@RequestMapping</span><span class="o">(</span><span class="s">&#34;/&#34;</span><span class="o">)</span>
	<span class="kd">public</span> <span class="n">String</span> <span class="nf">index</span><span class="o">()</span> <span class="o">{</span>
		<span class="n">helloService</span><span class="o">.</span><span class="na">execTask1</span><span class="o">();</span>
		<span class="n">helloService</span><span class="o">.</span><span class="na">execTask2</span><span class="o">();</span>
		<span class="n">helloService</span><span class="o">.</span><span class="na">execSyncTask</span><span class="o">();</span>
		<span class="k">return</span> <span class="s">&#34;welcome to lglspace&#34;</span><span class="o">;</span>
	<span class="o">}</span>

<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><h2 id="总结">总结</h2>
<ul>
<li>
<p>只有当@EnableAsync开启异步之后，@Async所注解的方法才会异步调用，被@Async注解的方法会在一个单独线程内运行。</p>
</li>
<li>
<p>@Async 注解的方法只能返回void或者future类型的返回值，其他值会使注解无效，因为不能异步执行。</p>
</li>
</ul>

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        2020-11-05
        
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